Exchange bias of singly inverted FeO/Fe3O4 core-shell nanocrystals

被引：134

作者：

Kavich, D. W. ^{[1
,2
]}

Dickerson, J. H. ^{[1
,2
]}

Mahajan, S. V. ^{[2
,4
]}

Hasan, S. A. ^{[2
,4
]}

Park, J. -H. ^{[3
]}

机构：

[1] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[2] Vanderbilt Univ, Vanderbilt Inst Nanoscale Sci & Engn, Nashville, TN 37235 USA

[3] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[4] Vanderbilt Univ, Interdisciplinary Program Mat Sci, Nashville, TN 37235 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.78.174414

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Exchange bias (EB) is investigated in singly inverted FeO/Fe(3)O(4) core-shell nanocrystals by vibrating sample magnetometry. A horizontal and vertical shift of the field-cooled (FC) hysteresis loop with respect to the zero-field-cooled (ZFC) hysteresis loop is observed below the blocking temperature of EB (T(B)(EB)approximate to T(N)). An enhancement of the superparamagnetic blocking temperature (T(B)(SP)approximate to 190 K) with respect to the expected value is observed from the ZFC/FC measurement of m(T). Furthermore, the value of T(B)(SP) is nearly constant for applied fields ranging from 25 to 200 Oe as a result of the exchange coupling at the antiferromagnetic/ferrimagnetic interface.

引用

页数：6

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